A Servo-Controlled Voltage Stabilizer is an electrical device that uses a closed-loop feedback system with a servo motor to provide a stable, constant output voltage despite wide fluctuations in the input power supply. The system works by continuously monitoring the output voltage and comparing it to a preset desired value. If a voltage deviation is detected, an electronic control circuit sends a signal to the servo motor, which then drives a variable transformer to adjust the voltage. This mechanism makes real-time, precise, and continuous corrections, ensuring a highly accurate output with a typical tolerance of just ±1%. This makes servo stabilizers an ideal choice for protecting sensitive and expensive equipment in commercial, industrial, and medical settings where voltage stability is critical.